Notice: Should you enter search phrase "6303RMX" into eBay or Amazon, you will see the availability of o.e.m size bearings - 10X42X13. "6303RMX" is stamped within the OEM idler #two bearings. I have sturdy uncertainties about these getting excellent bearings, such as the Koyo bearings labeled as getting manufactured in https://robustdirectory.com/listings1016384/debt-collection-in-anaheim-an-overview